We study tunnel magnetoresistance effect in ferromagnet/granular/ferromagnet tunnel junctions in the Coulomb blockade regime. The granular consists of a Al-O/Co/Al-O/Co/Al-O multilayer, which was sputtered sequentially. The magnetoresistance (MR) ratio and the resistance (Rs) of the junction increased with decreasing bias voltage at low temperatures. The MR ratio and Rs were calculated based on the theory proposed by Takahashi and Maekawa [S. Takahashi and S. Mackawa, Phys. Rev. B 90, 1758 (1998)]. Although the variation of these values on bias voltage was different from experimental results, the calculated MR ratio in the Coulomb blockade regime agreed well with the maximum value measured.
|Number of pages||3|
|Journal||Journal of Applied Physics|
|Issue number||9 II|
|Publication status||Published - 2000 May 1|
ASJC Scopus subject areas
- Physics and Astronomy(all)